Normally we haven't heard that a newly built house smell badly but if there is any problem regarding bad smell in the house then you can call to Allied Building Inspection Services. The home inspectors working over there are expert and find all the defects of the house like plumbing, roofing etc. They have special staff who are testing the molds with the help of thermal imaging along with air sampling and surface sampling in the houses and also removing all the molds from house.